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Why Are Small Dog Breeds More Prone to "Degenerative Mitral Valve Disease" Than Other Breeds?

Heart disease is one of the top health concerns in dogs, especially in small breeds aged 7 years and older, which have the highest incidence of Myxomatous Mitral Valve Disease (MMVD). This condition occurs when the mitral valve doesn't close properly, causing blood to flow backward and forcing the heart to work harder, eventually leading to an enlarged heart and heart failure.

Dog Breeds Commonly at Risk

• Pomeranian
• Chihuahua
• Shih Tzu
• Poodle

Why Are Small Breeds at Risk?

1. Genetic factors -- many small breeds have a genetic predisposition to mitral valve degeneration. As they age, the risk increases accordingly.
2. Heart structure -- small breeds tend to have problems with the valve itself, while large breeds tend to have problems with the heart muscle.
3. Longer lifespan -- since small breeds naturally live longer, degenerative changes in the organs have more time to accumulate in severity, becoming clearly apparent as they age.

Warning Signs to Watch For

• Chronic coughing, especially at night
• Easily tired, quick to pant
• Weakness or fainting
• Rapid breathing even at rest

Regular heart checkups starting early are key to extending your dog's life and slowing the progression of the disease, so their little heart can stay with you for as long as possible.

Article by: Dr. Puy, Dr. Pattawan, Veterinarian at the Cardiovascular Center and the Surgery and Anesthesia Center, Thonglor Pet Hospital Pattaya Branch